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19-5635; Rev 11/10
DS1230Y/AB
256k Nonvolatile SRAM
www.maxim-ic.com
FEATURES
PIN ASSIGNMENT
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10 years minimum data retention in the
absence of external power
Data is automatically protected during power
loss
Replaces 32k x 8 volatile static RAM,
EEPROM or Flash memory
Unlimited write cycles
Low-power CMOS
Read and write access times of 70 ns
Lithium energy source is electrically
disconnected to retain freshness until power is
applied for the first time
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V CC
WE
A13
A8
A9
A1 1
OE
A1 0
CE
DQ7
DQ6
DQ5
DQ4
DQ3
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Full ± 10% V CC operating range (DS1230Y)
Optional ± 5% V CC operating range
(DS1230AB)
28-Pin Encapsulated Package
740-mil Extended
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Optional industrial temperature range of
-40 ° C to +85 ° C, designated IND
JEDEC standard 28-pin DIP package
PowerCap Module (PCM) package
- Directly surface-mountable module
- Replaceable snap-on PowerCap provides
lithium backup battery
- Standardized pinout for all nonvolatile
SRAM products
- Detachment feature on PowerCap allows
NC
NC
NC
NC
V CC
WE
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
GND V BAT
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
NC
NC
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
easy removal using a regular screwdriver
34-Pin PowerCap Module (PCM)
(Uses DS9034PC+ or DS9034PCI+ PowerCap)
PIN DESCRIPTION
A0 - A14
DQ0 - DQ7
CE
W E
OE
V CC
GND
NC
1 of 10
- Address Inputs
- Data In/Data Out
- Chip Enable
- Write Enable
- Output Enable
- Power (+5V)
- Ground
- No Connect
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